Net current density of photoelectrons emitted from the surface of the GEOTAIL spacecraft

• Nakagawa Tomoko

  Tohoku Institute of Technology

• Ishii Takuma

  Tohoku Institute of Technology

• Tsuruda Koichiro

  The Institute of Space and Astronautical Science

• Hayakawa Hajime

  The Institute of Space and Astronautical Science

• Mukai Toshifumi

  The Institute of Space and Astronautical Science

抄録

The current density carried by photoelectrons emitted from the GEOTAIL spacecraft is estimated from the electric potential of the spacecraft measured in the single probe mode of GEOTAIL/EFD and plasma density and temperature obtained by GEOTAIL/LEP during the period from September 14, 1993 to October 31, 1998, by assuming balance of the currents carried by photoelectrons and ambient thermal electrons. Behaviour of the photoelectron current as a function of spacecraft potential is consistent with the current profile predicted by Grard (1973), and the emitted photoelectrons consist of several components with different temperatures. The saturation density of the low energy component of the photoelectron current is 85±33×10^-6 [Am^-2]. Number density of the photoelectrons is estimated to be 2.9±1.4×10⁹ [m^-3] at the surface of the spacecraft, and the average energy of the photoelectrons is 2.1±0.5 [eV]. These values are higher than the prediction by Grard but consistent with previous in-flight measurements from GEOS-1, ISEE-1 or Viking.

収録刊行物

• Ｅａｒｔｈ，　Ｐｌａｎｅｔｓ　ａｎｄ　Ｓｐａｃｅ

  Ｅａｒｔｈ，　Ｐｌａｎｅｔｓ　ａｎｄ　Ｓｐａｃｅ 52 (4), 283-292, 2000

  地球電磁気・地球惑星圏学会 、公益社団法人 日本地震学会、特定非営利活動法人 日本火山学会、日本測地学会、日本惑星科学会

キーワード

• Space and Planetary Science
• Geology

詳細情報

• CRID: 1390001206511095040
• NII論文ID: 10006710474
• NII論文ID: 130003780784
• NII書誌ID: AA11211921
• DOI: 10.1186/bf03351637
• ISSN: 18805981
• ISSN: 13438832
• NDL書誌ID: 5375270
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I5375270
• Web Site: https://link.springer.com/content/pdf/10.1186/BF03351637.pdf
• Web Site: https://link.springer.com/article/10.1186/BF03351637/fulltext.html
• Web Site: http://link.springer.com/content/pdf/10.1186/BF03351637
• 本文言語コード: en
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